Thread-cutting device for automatic weft-replenishing looms.



J. MARTINEK.

THREAD OUTTIG DEVIGBPOR AUTOMATIC WEFT REPLEN-ISHING LOOMS.

` APPLICATION FILED MAY Io, 1909.

972,118. I Patented 01:.4,191 0.

`(lNlTED STATES PATENT QFFTCE.

JOHANN MARTINEK, 0F VIERSEN, GERMANY.

THREAD-CUTTING DEVICE FOP.. AUTGMATIC WEFT-REPLENISHING LOOMS.

To @ZZ whom it may concern:

Be it known that I, JOHANN MARTINEK, a subject of the Emperor of Germany, residing at 30 Klratherstrasse, in the town of Viersen, Rhine Province, Prussia, in the German Empire, have invented certain new and useful Improvements in Thread-Cutting Devices for Automatic WeftReplen ishing Looms, of which the following is a speciiication.

The hitherto known devices for severing the ends of weft thread from the selvage of the fabric in the looms, are of two kinds: (l) Shears, having one stationary and one movable cutting blade, constantly working along the selvage of the fabric, for instance such as described in the American specifications Nos. 585,465 and esame/1906. (2) Devices having hooks which catch the filling ends and bring them in or against the cutting arrangement. Such devices are described in the American specifications Nos. @sogas/1899, 640,656/1900, 704,715/1902 and seines/1905.

The irst-mentioned devices are unsatisfactory inasmuch as they are quickly worn out and therefore must often be renewed, besides, as they must be kept as some distance from the selvage, they do not for certain prevent the thread ends from being caught in the cloth. The second-mentioned devices, of which there are many modifications in the market, have not been successful either, in that they are generally complicated and expensive of production and do not insure an even and certain removal of the thread ends. The hooks are not always. reliable, and even when the thread ends are properly caught by them, they are often dropped again before coming into Contact with the cutting blades. On the other hand, when the thread ends are brought against the cutting blades, they are often caught between the latter instead of being cut off and are then torn away through the movement of the fabric. Even when the hooks are quite new, and thus more reliable, the thread ends are only cut olf at a certain distance from the selvage which therefore, at all events, is not made perfectly even. Most looms, therefore, are worked without cutting device.

The present invention relates to a cutting device which, while cutting the thread ends close to the edge of the fabric, acts im1ne- Specification of Letters Patent.

Application led May 10, 1909.

Patented Oct. 4, 1910. Serial No. 495,006.

diately before the lay returns and the next shot of the shuttle takes place. lt only works at each change of pirn and is therefore correspondingly durable and it is absolutely reliable in its function.

In the annexed drawings, the invention is illustrated, Figure l representing the device in resting, and Fig. 2, in working position. Fig. 3 is a plan of the device. Fig. 4 shows the cutting blades closed and withdrawn, and Fig. 5, the same open for work ing.

The device consists of an arm a, a casing b rigidly connected to the same, and a baseplate c, of which the latter is suitably arranged on the temple stand of an automatic loom. The arm a is slidablyconnected to the base-plate c and controlled by a spring a, so that, in the event of any miscarrying of the shuttle, the temple can yield together with the base-plate, without inflicting any injury to the device or to the reed. In the casing b, which at both ends is provided with slots, a slide al is mounted. Said slide is provided with serrations on its upper edge and is forced by a spring` e as far to the left as a slot CZ and a pin d, guided in same, will allow. At the side of the slide d, a locking lever f is arranged, which is provided with two pins f and f, of which the former serves as adetent for the slide CZ, whereas the latter alternately stops and releases an actuating lever g connected to the shears. The lever g, which with one end is pivoted to one of the cutting blades, is at the opposite end provided with a pin q engaging with the serrations of the slide d. It is further provided with a catch g adapted to Contact with the pin f of the lever f. The shears consist of two cut-ting blades /i and t', pivotally connected at y'. The blade h is provided with an arm L which is pivoted to the lever g, and the arrangement is such that when said arm z/ is actuated in the position shown in Fig. 5, the blades are lirst closed on one another and thereupon withdrawn, entirely or nearly so, into the slot of the arm a where they are slidably mounted. This position is shown in Fig. 4f. A strong spring 7c presses the shears out of the slot in open position, as soon as the rest of the mechanism allows it to do so. A spring Z, arranged in the casing, is adapted to press the levers f and g downward. Finally, a starting lever m is provided which contacts With the lever f and coperates with the replenishing mechanism of the loom in such a manner that it assumes the position shown in Fig. 2 for every change of pirn.

The Working of the device is as follows In the position shown in Fig. 1, the shears are closed and Withdrawn into the ,slot of the arm a. The lever g is held by the pin f, and the slide cl by the pin f of the lever f. When the replenishing mechanism is put into operation, `it actuates 'the lever m so that it presses the engaging arm of the Alever 7e downward, thereby raising the opposite arm and with it1the pinsjy" and f, so as to release the slide Z and the lever g.l The former is then forced out by the spring e and the latter, Vtogether :With the cutting blades z, and z', #moved by the spring 7c `into the :position shown in Fig. 2. The replenishing mechanismhaving performed its service,t`he lever '7n-returns Ito its initial1position.`

The arm it of the blade h is now Within the reach offthe lay=ofthe l'oom,by each stroke of Whiohsaid Iarm, 'and /With it the shears,

are moved'baclr 'into lthe position shown in Fig. 4. -At each such movement the shears first cut off thethread4 ends from theselvage andthen retire into their'slot solas 'not to come into'contact with and damage the reed. Following the movements of the arm 71,', the

lever g each time returns the slide d one tootlispace, by means of fthe pin g. lThe slide Z cannot partake in the return movements vof the lever g, asit is held back by the pin-f. `"llheoperation of the shears thus continues until the pin f has `passed the last Serrat-ion of theslide (l, when the lever f descends'and arrests the 'lever g bymeans of the pin f. rest until it is again set in operation by the replenishing mechanism.

I claim:-

1. An automatic cutting device'for automatic Weft-replenishing looms, comprising a base plate mounted on the temple stand, an arm and a casing slidably mounted on said `base plate, pivotally connected cutting blades slidably arranged Ain a slot in said arm Vand .adapted to cut the thread ends close tothe selvage of the fabric, an'armon one of said blades adapted to be actuated by the lay-of Vthe loom when the device is in operative position'so as to close the blades for cutting fthe thread and thereupon to withdraw them into the slot, means for retaining the cutting blades in the slot in inoperative position after a pre-determinedy number of cutting operations, and means for releasing the blades through the action ofthe lreplenishingi mechanism, substantially as set forth. y

2. An automatic cutting device forauto- The device now remains atl ing, cutting blades actuated by the lay slidably arranged in a slot in said arm and adapted to cut the thread ends from the selvage of the fabric and then to Withdraw into said slot, a spring tending to hold said cutting blades in operative position, an actuating lever mounted in said casing and pivoted to one of said blades, a spring-actuated slide, provided on its upper edge with serrations, arranged at the side of said lever, a

,pin on said lever adapted to engage with the serrations of said slide so as to move it the space ofa seri-ation, against the action. of its spring, for each reciprocating movement With the cutting blades, means for locking said slide and said lever in inoperative position when the slide has been sufficiently advanced by the lever, and means for putting the device into operation through the action of the replenishing mechanism, substantially as set forth.

3. An automatic cutting device for automatic weft-replenishing looms, comprising a casing mounted With a base plate on a temple stand, an arm connected to said casing, `pivot-ally connected cutting blades arranged in a slot in said arm and adapted to cut the thread ends from the selvage of the fabric and then withdraw into said slot 'through the action of the lay, a spring vadapted to open and to advance said cutting blades when the lay moves back, an actuating lever arranged in said casing and connected to one of said cutting blades so as to follow their movements and thereby to advance a spring-actuated slide mounted at its side, a double-armed locking lever pivoted at the other side of said slide, pins-on one arln of said lever, one adapted to lock said slide when the latter has been suliciently advanced by the actuating lever, and the other to lock the actuating lever and thereby the cutting blades in inoperative position, a spring controlling the Avertical movements of said levers, and a starting ylever coperating With the replenishing mechanism and engaging with said locking lever so as to release said slide and said ac-4 tuating lever with the cutting blades when the replenishing mechanism is operated, substantially as set forth.

4. An automatic cutting device for automatic weft-replenishing looms, comprising a casing mounted with a base plate on the temple stand, pivotally connected cutting blades arranged in an arm on said casing and held in cutting position by a spring and adapted to be actuated by the lay so as to close for the purpose of cutting the thread ends and then to Withdraw into a slot in said arm, an ractuating lever connected to one of said cutting blades *and adapted to advance a spring-actuated-slide provided with serrations through the space of a serration for each movement, a lever adapted to lock said slide and said actuating lever When the pin on said locking lever has passed the last serraton of said slide, and a starting lever coperating With the replenshng mechanism and engaging with said locking lever s0 that the cutting device is put into temporary operation as soon as the said replenishing mechanism is actuated, substantlally as set forth.

JOHANN MARTINEK.

7i tnesses JOSEPH SCHAEFFERS, LOUIS VANDORN. 

